{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\hline\hline
                    &\multicolumn{4}{c}{\specialcell{\;\;\;\;\; Drinking water fecal contamination \;\;\;\;\;}}\\\cmidrule(lr){2-5}
                    &\multicolumn{1}{c}{(1)}   &\multicolumn{1}{c}{(2)}   &\multicolumn{1}{c}{(3)}   &\multicolumn{1}{c}{(4)}   \\
\hline
Source fecal contamination&       0.243***&       0.224***&       0.246***&       0.225***\\
                    &     (0.015)   &     (0.015)   &     (0.015)   &     (0.015)   \\
Travel time in minutes, measured&       0.000   &       0.004   &       0.004   &       0.008   \\
                    &     (0.014)   &     (0.012)   &     (0.014)   &     (0.012)   \\
Storage, observed   &       0.074***&       0.064***&               &               \\
                    &     (0.010)   &     (0.010)   &               &               \\
Constant            &      -0.011   &      -0.013***&      -0.021** &      -0.022***\\
                    &     (0.010)   &     (0.001)   &     (0.010)   &     (0.001)   \\
\hline
Treatment unit fixed effects&          No   &         Yes   &          No   &         Yes   \\
R2                  &        0.07   &        0.14   &        0.06   &        0.13   \\
Obs                 &        5831   &        5831   &        5832   &        5832   \\
\hline\hline
\end{tabular}
}
